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Moment Capacity

Summary

The moment capacity is maximum bending moment that can be resisted by an element before it fails in bending.

Technical Information

Flexure (bending) is often the critical mode of failure in concrete floors; therefore the moment capacity of the floor is very important. As concrete has a very low tensile strength relative to its compressive strength, it can very easily crack and fail on the edge which is in tension. Therefore, any concrete element which is subject to significant bending moments requires reinforcement with a material which is strong in tension (usually steel).

Two simple ways to increase the moment capacity of an element are:

  • Increase the amount of reinforcement in the element.
  • Increase the depth of the element to increase the lever arm of the force exerted by the reinforcement.

Finding the moment capacity of steel and macro-synthetic fibre-reinforced concrete is more complex than the methods used in calculating capacities of traditional reinforced concret. This is because it requires a notched beam test to be conducted with the actual fibre to be used in the design. The test acquires values of fR1, fR2, fR3 and fR4 which can be used to carry out moment capacity analysis on the slab.

Related Definitions

Resources

  1. Eurocode 2

  2. BRITISH STANDARDS INSTITUTION, EN 14889. Fibres for concrete, Part 1: Steel fibres –definition, specification and conformity, Part 2: Polymer fibres – definition, specification and conformity, BSI, London, 2006.

  3. RILEM Final recommendations of TC 162-TDF. Test and design methods for steel fibre reinforced concrete: bending test, Materials and Structures, Vol. 35, November 2002, pp. 579-582.

  4. TR34

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